 #include <stdio.h>
 #include <math.h>
int main()
 {
   float a,x0,x1;
   printf("enter a positive number:");
   scanf("%f",&a);
   x0=a/2;
   x1=(x0+a/x0)/2;
   do
     {x0=x1;
      x1=(x0+a/x0)/2;
     }while(fabs(x0-x1)>=1e-5);
   printf("The square root of %5.2f  is %8.5f\n",a,x1);
   return 0;
 }